Sealed motor compressor

Abstract

A sealed motor compressor in which a motor running efficiency is largely enhanced with a single-phase bipolar constitution, an electromotive element is fixed to a sealed container, and formed of a stator provided with a stator winding, and a rotor which rotates in the stator, and the rotor is formed of a squirrel-cage secondary conductor disposed in a peripheral portion of a rotor yoke, and a permanent magnet is embedded in the rotor yoke.

What is claimed is:  
     
       1. A sealed motor compressor comprising, in a sealed container, a compressing element and an electromotive element for driving the compressing element, 
       wherein said electromotive element is fixed to said sealed container and comprises a stator provided with a stator winding and a rotor which rotates in the stator, and  
       wherein said rotor comprises a squirrel-cage secondary conductor disposed in a peripheral portion of a rotor yoke and a plurality of rare earth permanent magnets embedded in the rotor yoke, and  
       wherein the squirrel-cage secondary conductor of the rotor comprises a skewed structure.  
     
     
       2. The sealed motor compressor according to  claim 1 , wherein the electromotive element comprises a single-phase bipolar constitution. 
     
     
       3. The sealed motor compressor according to  claim 2 , wherein the electromotive element is started by a system in which a startup capacitor is used. 
     
     
       4. The sealed motor compressor according to  claim 2 , wherein the stator winding comprises a main winding and an auxiliary winding, and a winding ratio of the respective windings by effective winding number calculation is set to be in a range of 1.0±0.5. 
     
     
       5. The sealed motor compressor according to  claim 1 , wherein the squirrel-cage secondary conductor of the rotor comprises a skewed structure. 
     
     
       6. The sealed motor compressor according to  claim 1 , wherein the number of the rare earth permanent magnets embedded in the rotor yoke is any number selected from the group consisting of two, four, six and eight. 
     
     
       7. The sealed motor compressor according to  claim 1 , further comprising current-sensitive protection means for detecting a line current. 
     
     
       8. A sealed motor compressor comprising, in a sealed container, a compressing element and an electromotive element for driving the compressing element, said electromotive element being driven by a three-phase power source, 
       wherein said electromotive element is fixed to said sealed container and comprises a stator provided with a stator winding and a rare earth permanent magnet embedded type rotor which rotates in the stator, and  
       said rotor comprises a squirrel-cage secondary conductor disposed in a peripheral portion of a rotor yoke and a plurality of rare earth permanent magnets embedded in said rotor yoke, and  
       wherein the squirrel-cage secondary conductor of the rotor comprises a skewed structure.  
     
     
       9. The sealed motor compressor according to  claim 8 , wherein the electromotive element comprises a three-phase bipolar constitution. 
     
     
       10. The sealed motor compressor according to  claim 8 , wherein a skew pitch is set to more than 0, and 1.5 slot pitches or less. 
     
     
       11. The sealed motor compressor according to  claim 8 , wherein the number of the rare earth permanent magnets embedded in the rotor yoke is any even number. 
     
     
       12. The sealed motor compressor according to  claim 8 , wherein the number of the permanent magnets embedded in the rotor yoke is any even number. 
     
     
       13. The sealed motor compressor according to  claim 8 , wherein capability control is possible.